Gearing for drill-presses.



R. MILNE. GEARING FOR DRILL PRESSES. APPLICATION FILED JUNE 12, 1911.

2 SHEETS-SHBET 2.

Patented Nov. 7, 1911.

jEssEs ITED STATES PA'IEN OFFICE.

ROBERT MILNE, OF ROCKFORD, ILLINOIS, ASSIGNOR TO ROCKFORD DRILLINGMACHINE COMPANY, OF ROCKFORD; ILLINOIS, A CORPORATION OF ILLINOIS.

GEABING FOR DRILL-PRESSES.

To all whom it may concern:

Be it known that I, ROBERT MILNE, a citizen of the United States,residing at Rockford, in the county of Winnebago and State of Illinois,have invented certain new and useful Improvements in Gearing for DrillPresses, of which the following is a specification.

This invention relates to a certain im provement in gearing for drillpresses, whereby the speed of rotation of the drill spindle is changedor controlled when such spindle is driven from a shaft rotating atconstant speed.

The invention also relates to certain interlocking connections, wherebythe power belt must first be thrown off from the driving pulley of thedrill before the gearing can be changed, thus removing the danger whichhas heretofore existed of stripping gears, and obviating the undesirablenoise and commotion which usually occurs when changing from one gearratio to another.

It will be understood at the outset that the ordinary drill press isprovided with a main shaft, on which are mounted two pulleys, one beingsecured to the shaft and the other one being loose thereon. From thismain shaft the power is transmitted through suitable gearing to thedrill spindle. A belt is usually run from a line or jack shaft to thesecured or to the loose pulley, so that by shifting the belt onto thesecured pulley the drill press will be driven, while if the belt isshifted onto the loose pulley the latter will rotate freely on the mainshaft, and the drill press will not be driven.

In the construction of a drill press, it is customary to provide meansfor changing the ratio of drive from the main shaft of the same to thedrive spindle, and such means may include a cone pulley, or a box ofgears, or any other suitable mechanism. In the present case, I do notconcern myself particularly with the aforementioned mechanism butprovide in addition a back gearing connection which may be used incombination with a cone pulley or a box of gears, as desired. It ispreferred, however, that the transmission from the cone pulley or thebox of gears to the particular mechanism of the present invention bethrough the medium of a belt passing over a. pulley on the auxiliaryshaft, which pulley is of uniform diameter. In this way the maximumpower may Specification of Letters Patent.

Application filed June 12, 1911.

Patented Nov. 7, 1911.

Serial No. 632,661.

be transmitted to the drill spindles, regardless of the ratio of drivebeing used.

One of the principal objects of this invention is to provide a gearingfor the drill press, such that the maximum driving force can always besecured, regardless of the rat-i0 between speed rotation of the drillspindle and the main shaft. Other objects of the invention are: toprovide a drill press having a back gearing connection which may beinstantaneously thrown into or out of service, so that the drive will bedirectly to the drill spindle or through the back gearing, as desired,the gear and pinion on the back gearing being removable so that theirratio can be changed from time to time; to provide a construction inwhich a flat belt pulley may be used, that is, one having a uniformdiameter throughout its length, so that the speed change belt can beshifted from position to position with the least ainount of difficulty,and so that the maximum amount of belt driving force may always beattained; to provide a lever for throwing the back gear connection intoand out of service as desired; to provide a lever for throwing the powerbelt from the jack shaft onto "the loose or the driving pulley of themain shaft as desired; to interlock both of said levers, so that theback gear connection cannot be changed until the power belt has beenfirst thrown onto the loose pulley; to so construct the back gearconnection that the drill spindle will be rotated in the same direction,whether the back gear connection be in service or not; and in other waysand manners to generally improve the construction of this type ofmachine.

Other objects and uses will appear from a detailed description of theinvention, which consists in the features of construction andcombination of parts hereinafter described and claimed.

Referring now to the drawings, Figure 1 shows a side View of the entiredrill press, the back gear connection being thrown out of service, andthe belt shifter being thrown into driving position; Fig. 2 shows across section through the back gearing mechanism, the back gear beingthrown into operative position; Fig. 3 shows a cross section, taken online 38 of Fig. 2, looking in the direction of the arrows; and Fig. 4shows a cross section through the back gears.

In the embodiment of my invention, I

provide an auxiliary shaft and a back gear shaft, substantially parallelto each other and preferably at right" angles to the drill spindle. Thedrill spindle is provided with a pair of bevel gear faces, and theauxiliary shaft and the back gear shaft are each provided with a bevelgear adapted to mesh with the corresponding bevel gear face of the drillspindle. At their rear ends, the auxiliary shaft and the back gear shafteach carry a pinion or gear, which pinion and gear may be meshedtogether; but the lengths of the shafts are so proportioned that whenthe back gears are thrown into mesh the bevel gear of the back gearshaft meshes with the drill spindle, but the bevel gear of the auxiliaryshaft does not so mesh; while when the bevel gear on the auxiliary shaftmeshes with the drill spindle the back gear shaft will be thrown intoinoperative position. Means are then pro vided for shifting both theauxiliary shaft and the back gear shaft longitudinally, in oppositedirections however, so that proper gear meshings will be secured whenthe shafts are in either position. This shifting mechanism preferablyincludes a hand lever. A suitable lever connection is provided forthrowing the driving belt onto the driving or loose pulley as desired,and this lever in turn is interlocked with the lever for the back gearconnection as aforesaid.

Referring now to the drawings, the frame of the drill press isdesignated by the numeral 5. In its lower portion it is provided with amain shaft, on which are mounted a fixed or driving pulley 6 and a loosepulley 7. The belt from the jack shaft passes over one or the other ofthese pulleys. Any suitable speed change gearing 8 is provided and achange speed belt 9 passes from the gearing 8 over a pulley 10 on theauxiliary shaft. The pulley 10 is mounted on an auxiliary shaft 11,which is journaled in the frame of the drill press at the point 12, andwhich carries a bevel gear 13 at its other end. At the bevel gear end itcarries a rack sleeve 14, which is supported in the frame of the drillpress at the point 15, and is prevented from rotation by a pin 16, whichengages a longitudinal groove 17 in the sleeve. A collar 18 on the shaftinsures that the shaft will move back and forth in accordance with themovements of the sleeve 14.

The drill spindle shaft is designated by the numeral 19. At its upperend 20 it carries a combined bevel gear 21., having an up per gear face22 and a lower gear face 23. This lower gear face is adapted to meshwith the bevel gear 13 on the auxiliary shaft, and the two gears arepreferably of equal diameter, so that a ratio of one to one is securedfrom the auxiliary shaft to the drill spindle shaft 19 when these gearsare in mesh.

A back gear shaft 24, preferably parallel to the auxiliary shaft 11, isjournaled in the frame of the press at the point 25, and at its otherend carries a bevel pinion 26. Ad" jacent to this pinion it carries arack slee'e 27, slidably mounted in the frame of the press at the point28, and prevented from rotation by a pin 29, which engages a groove 30.A collar 31 insures that the back gear shaft will move back and forth inaccord ance with the movements of the sleeve 27. The bevel pinion 26 isadapted to mesh with the gear face 22, and it is preferably of fewerteeth than the same, so that a considerable speed reduction is obtainedwhen the bevel pinion is meshing with the bevel gear.

- A pinion 32 is removably mounted on the rear end of the auxiliaryshaft 11, and a gear 33 is removably mounted on the rear end of the backgear shaft 24, nuts 35 and 36 holding this pinion and gear in positionon their respective shafts.

A segmental gear 37, mounted on a shaft 38, is adapted to engage therack faces of the sleeves 14 and 27, so that by rotating said shaft 38the auxiliary shaft will be thrown in one direction and the back gearshaft in the other direction, or vice-versa. Then the elements arethrown into the position illustrated in Fig. 1, the bevel gear 13 of theauxiliary shaft will directly drive the drill spindle shaft, the bevelpinion 26 of the back gear shaft being in inoperative position, and thepinion 32 being out of mesh with the gear 33. On the other hand, whenthe shaft 38 is rotated, so as to throw the auxiliary and back gearshafts into the position shown in Fig. 2, the bevel gear 13 will bewithdrawn from the bevel gear of the drill spindle shaft, the bevelpinion 26 of the back gear shaft will mesh with the bevel gear of thedrill spindle shaft, and the pinion 32 will mesh with the gear 33. Anexamination of the relative meshings of the gears and pinions will showthat when the elements are in either of the aforementioned positions,the drill spindle shaft will rotate in the same direction, provided thatthe pulley 10 continues to rotate in the same direction. Obviously, achange of drill spindle speed is instantaneously secured by rotating theshaft 38 in one direction or the other, and this change of speed willalways be of the same ratio, provided the pinion 32 and the gear 33 arenot changed. However, it is manifest that by changing the ratio of thepinion 32 and the gear 33, a still fun ther change of ratio can besecured, and to this end the pinion 32 and the gear 33 are removablymounted on their respective shafts, as illustrated in Fig. 4.

Referring again to Fig. 1, the shaft 38 carries a lever arm 39, which isprovided with a pair of pins 40 and 41. A lever arm 42, pivoted at thepoint 43, controls the back and forth movements of a belt shifter 44through the medium of a link 45, bell crank 46, and rod 47. The handles48 and 49 of the levers 39 and 42, respectively, are placed in closeproximity so that they can be easily manipulated. The lever 42 carries apair of fingers 50 and 51, respectively, either one of which may bethrown up between the pins 40 and 41. \Vhen this has been done the lever39 cannot be swimg to throw the back gearing into or out of commission,and in fact the lever cannot be swung at all until the lever 42 has beenthrown down into the dotted line position so as to throw the beltshifter over into its dotted line position, thus carrying the belt ontothe loose pulley 7. hen the belt has been thrown over onto the loosepulley, the lever arm 42 being in the dotted line position, the lever 39may be swung over to throw in the back gearing connection, and thenpower may be applied by raising the arm 42 and thus shifting the beltback onto the power pulley 6. It is thus seen that the movements of theback gearing connection and the belt shifter are perfectly interlocked,thus largely reducing the danger of stripping gears, creating animdesirable noise, etc.

Of course, it will be understood that the back gearing connection, whichis one of the features to which the present invention relates, may beused in combination with any form of speed control desired, whether itbe a set of cone pulleys, or a box of gears as illustrated in thedrawings of the present invention. By the use of a speed controlmechanism such as a box of gears, any one of, say, five speeds may beobtained when directly driving from the auxiliary shaft to the drillspindle, and any one of five other speeds may be obtained when drivingthrough the back gearing connection. This would make it possible toobtain ten speeds without changing the pinion 32 and the gear 33. Byreason of the fact that the pinion and gear are removably attached totheir respective shafts, it is evident that the operator may obtainother gear ratios between the auxiliary and the back gearing shafts, sothat still other speeds may be obtained when desired.

The feature of interlocking the movements of the back gear connectionwith the movements of the belt shifter is very important and desirable,because it insures that the operator will always throw off the powerfrom the drill press before he can change the back gearing connection.This being the case, the machine will come practically to rest before hecan manipulate the lever 39 to change the back gearing connection.

I claim: 1. The combination with a rotatable member, of a longitudinallymovable auxiliary shaft, a longitudinally movable back gearing shaft,means for driving the rotatable member from the auxiliary shaft whensaid shaft is in one longitudinal position, means for driving therotatable member from the back gearing shaft when said shaft is in onelongitudinal position, and means for driving the back gearing shaft fromthe auxiliary shaft when the back gearing shaft is in the aforementionedlongitudinal position, substantially as described.

2. The combination with a rotatable member, of a longitudinally movableauxiliary shaft, a longitudinally movable back gearing shaft, means fordriving the rotatable member from the auxiliary shaft when said shaft isin one longitudinal position, means for driving the rotatable memberfrom the back gearing shaft when said shaft is in one longitudinalposition, and means for driving the back gearing shaft from theauxiliary shaft when the back gearing shaft is in the aforementionedlongitudinal position, and the auxiliary shaft is in anotherlongitudinal position, substantially as clescribed.

3. The combination with a rotatable member of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on thesame adapted to mesh with one of the bevel gears of the rotatable memberwhen the auxiliary shaft is in one longitudinal position, a back gearingshaft, a bevel gear on the same adapted to mesh with one of the bevelgears of the rotatable member when the back gearing shaft is in onelongitudinal position, and means for driving the back gearing shaft fromthe auxiliary shaft, substantially as described.

4. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on thesame adapted to mesh with one of the bevel gears of the rotatable1nemher when the auxiliary shaft is in one longitudinal position, a backgearing shaft, a bevel gear on the same adapted to mesh with one of thebevel gears of the rotatable member when the back gearing shaft is inone longitudinal position, and means for driving the back gearing shaftfrom the aux iliary shaft when the back gearing shaft is in theaforementioned longitudinal position, and the auxiliary shaft is inanother longitudinal position, substantially as described.

5. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on thesame adapted to mesh with a bevel gear of the rotatable member when theauxiliary shaft is in one position, a back gearing shaft, a bevel gearon the same adapted to mesh with a bevel gear of the rotatable memberwhen the back gearing shaft is in one longitudinal position,

means for shifting both of said shafts longitudinally, and a backgearing connection between said shafts when the bevel gear of the backgearing shaft is in engagement with a bevel gear of the rotatablemember, and the bevel gear of the auxiliary shaft is disengaged from abevel gear of the rotatable member, substantially as described.

6. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on thesame adapted to mesh with a bevel gear of the rotatable member when theauxiliary shaft is in one position, a back gearing shaft, a bevel gearon the same adapted to mesh with a bevel gear of the rotatable memberwhen the back gearing shaft is in one longitudinal position, means forshifting both of said shafts longitudinally in opposite directions atthe same time and a back gearing connection between said shafts when thebevel gear of the gearing shaft is in engagement with a bevel gear ofthe rotatable member, and the bevel gear of the auxiliary shaft isdisengaged from a bevel gear of the rotatable member, substantially asdescribed.

7. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on thesame adapted to mesh with a bevel gear of the rotatable member when theauxiliary shaft is in one longitudinal position, a gear on the rear endof the auxiliary shaft, a longitudinally movable back gearing shaft, abevel gear on the same adapted to mesh with a bevel gear of therotatable member when the back gearing shaft is in one longitudinalposition, and a gear on the rear end of the back gearing shaft adaptedto mesh with the gear on the rear end of the auxiliary shaft,substantially as described.

8. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on thesame adapted to mesh with a bevel gear of the rotatable member when theauxiliary shaft is in one longitudinal position, a gear on the rear endof the auxiliary shaft, a longitudinally movable back gearing shaft, abevel gear on the same adapted to mesh with a bevel gear of therotatable member when the back gearing shaft is in one longitudinalposition, a gear on the rear end of the back gearing shaft, and meansfor shifting both of said shafts longitudinally in opposite directionsat the same time, substantially as described.

9. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on oneend of the same adapted to mesh with a bevel gear on the rotatablemember, a gear on the rear end of said shaft,

a longitudinally movable back gearing shaft, a bevel gear on the sameadapted to mesh with a bevel gear of the rotatable member, a gear on therear end of said shaft adapted to mesh with the gear on the rear end ofthe auxiliary shaft, and a lever connection for shifting both of saidshafts longitudinally, substantially as described.

10. The combination with a rotatable member, of a pair of bevel gears onthe same, a longitudinally movable auxiliary shaft, a bevel gear on oneend of the same adapted to mesh with a bevel gear of the rotatablemember, a gear on the rear end of said shaft, a longitudinally movableback gearing shaft, a bevel gear on the same adapted to mesh with abevel gear of the rotatable member, a gear on the rear end of said shaftadapted to mesh with the gear on the rear end of the auxiliary shaft,and a lever connection for shifting both of said shafts longitudinallyin opposite directions at the same time, substantially as described.

11. The combination with a rotatable member, of a longitudinally movableauxiliary shaft, means for driving the rotatable member from theauxiliary shaft when said shaft is in one longitudinal position, alongitudinally movable back gearing shaft, means for driving therotatable member from the back gearing shaft when the same is in oneposition, means for shifting both of said shafts longitudinally inopposite directions at the same time, and means for driving the backgearing shaft from the auxiliary shaft when the back gearing shaft is indriving connection with the rotatable member, substantially asdescribed.

12. The combination with a rotatable member, of a longitudinally movableauxiliary shaft, means for driving the rotatable member from theauxiliary shaft when the same is in one position, a longitudinallymovable back gearing shaft, means for driving the rotatable member fromthe back gearing shaft when the same is in one position, a rack collaron each of said shafts, a segmental gear engaging both of the racks ofsaid collars, means for rotating said segmental gear to shift both ofthe shafts at the same time, and means for driving the back gearingshaft from the auxiliary shaft when the back gearing shaft is in drivingconnection with the rotatable member, substantially as described.

13. The combination with a rotatable member, of a longitudinally movableauxiliary shaft, means for driving the rotatable member from theauxiliary shaft when the same is in one position, a longitudinallymovable back gearing shaft, means for driving the rotatable member fromthe back gearing shaft when the same is in one position, a rack collaron each of said shafts, a gear engaging both of the racks of saidcollars,

means for rotating said gear to shift both of the shafts in oppositedirections at the same time, and means for driving the back gearingshaft from the auxiliary shaft when the back gearing shaft is in drivingconnection with the rotatable member, substantially as described.

1 1. The combination with a rotatable member and mechanism forcontrolling power, of a longitudinally movable auxiliary shaft, meansfor driving the rotatable member from the auxiliary shaft when the sameis in one longitudinal position, a longitudinally movable back gearingshaft, means for driving the rotatable member from the back gearingshaft when the same is in one longitudinal position, means for shiftingboth of said shafts longitudinally, means for shifting the powercontrolling mechanism, and an interlocking connection between theshifting means of the power controlling mechanism and the shaft shiftingmeans, whereby the shafts cannot be shifted longitudinally when power isapplied to the auxiliary shaft, substantially as described.

15. The combination with a rotatable member and mechanism forcontrolling power, of a longitudinally movable auxiliary shaft, meansfor driving the rotatable memher from the auxiliary shaft when the sameis in one longitudinal position, a longitudinally movable back gearingshaft, means for driving the rotatable member from the back gearingshaft when the same is in one longitudinal position, means for shiftingboth of said shafts longitudinally in opposite directions at the sametime, means for shifting the power controlling mechanism, and aninterlocking connection between the shifting means of the powercontrolling mechanism and the shaft shifting means, whereby the shaftscannot be shifted longitudinally when power is applied to the auxiliaryshaft, substantially as described.

16. The combination with a rotatable member, and mechanism forcontrolling power, of a longitudinally movable auxiliary shaft, meansfor driving the rotatable member from the auxiliary shaft when the sameis in one longitudinal position, a longitudinally movable back gearingshaft, means for driving the rotatable member from the back gearingshaft when the same is in one longitudinal position, means for shiftingboth of said shafts longitudinally in opposite direc tions at the sametime, means for driving the back gearing shaft from the auxiliary shaftwhen the back gearing shaft is in driving connection with the rotatablemember, means for shifting the power controlling mechanism, and aninterlocking connection between the shifting means and the shaftshifting means of the power controlling mechanism, whereby the shaftscannot be shifted longitudinally when power is applied to the auxiliaryshaft, substantially as described.

17 The combination with a rotatable member and mechanism for controllingpower, of a longitudinally movable auxiliary shaft, means for drivingthe rotatable member from the auxiliary shaft when the same is in onelongitudinal position, a longitudinally movable back gearing shaft,means for driving the rotatable member from the back gearing shaft whenthe same is in one longitudlnal position, a lever for shifting both ofsaid shafts longitudinally, a lever for shifting the power controllingmechanism, and an interlocking connection between both of said levers,whereby the shafts cannot beshifted longitudinally while power isapplied to the auxiliary shaft, substantially as described.

18. The combination with a rotatable member and mechanism forcontrolling power, of a longitudinally movable auxiliary shaft, meansfor driving the rotatable member from the auxiliary shaft when the sameis in one longitudinal position, a longitudinally movable back gearingshaft, means for driving the rotatable member from the back gearingshaft when the same is in one longitudinal position, a lever forshifting both of said shafts longitudinally in opposite directions atthe same time, means for driving the back gearing shaft from theauxiliary shaft when the back gearing is in driving connection with therotatable member, alever for shifting the power controlling mechanism,and an interlocking connection between both of said levers, whereby theshafts cannot be shifted longitudinally while power is applied to theauxiliary shaft, substantially as described.

19. The combination with a rotatable member, of a longitudinally movableauxiliary shaft, a longitudinally movable back gearing shaftsubstantially parallel to the same, means for driving the rotatablemember from the auxiliary shaft when the same is in one position, meansfor driving the rotatable member from the back gearing shaft when thesame is in one posit-ion, a back gearing connection from the auxiliaryshaft to the back. gearing shaft when the back gearing shaft is indriving connection with the rotatable member, and means forshifting-both of said shafts longitudinally in opposite directions atthe same time, sub stantially as described.

ROBERT MILNE.

W'itnesses:

SAMUEL H. REOK, H. LEEOH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

